2 * Copyright (c) 2011, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of JANET(UK) nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Message protection services: determine maximum input size.
37 #include "gssapiP_eap.h"
39 OM_uint32 GSSAPI_CALLCONV
40 gss_wrap_size_limit(OM_uint32 *minor,
41 #ifdef HAVE_HEIMDAL_VERSION
42 gss_const_ctx_id_t ctx,
48 OM_uint32 req_output_size,
49 OM_uint32 *max_input_size)
51 gss_iov_buffer_desc iov[4];
52 OM_uint32 major, overhead;
54 if (ctx == GSS_C_NO_CONTEXT) {
56 return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
61 GSSEAP_MUTEX_LOCK(&((gss_ctx_id_t)ctx)->mutex);
63 if (!CTX_IS_ESTABLISHED(ctx)) {
64 major = GSS_S_NO_CONTEXT;
65 *minor = GSSEAP_CONTEXT_INCOMPLETE;
69 iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
70 iov[0].buffer.value = NULL;
71 iov[0].buffer.length = 0;
73 iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
74 iov[1].buffer.length = req_output_size;
75 iov[1].buffer.value = NULL;
77 iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
78 iov[2].buffer.value = NULL;
79 iov[2].buffer.length = 0;
81 iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
82 iov[3].buffer.value = NULL;
83 iov[3].buffer.length = 0;
85 major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
86 NULL, iov, TOK_TYPE_WRAP, 4);
90 overhead = iov[0].buffer.length + iov[3].buffer.length;
92 if (iov[2].buffer.length == 0 && overhead < req_output_size)
93 *max_input_size = req_output_size - overhead;
98 GSSEAP_MUTEX_UNLOCK(&((gss_ctx_id_t)ctx)->mutex);